Zenith Z-100 Reference Manual page 54

Table 4.3. VO Configuration Data
BIT ¹
0
0 0
0 I
I 0
I 1
4 & 5
0 0
0 I
C)
6 & 7
0 0
0 I
I 0
I I
9 1 0
& 11
12
Q „
1 4 & 15
MEANING
Disk drives installed in system.
8087 coprocessor i ns t al l ed.
Amount of base RAM (device size) installed on the user memory
card(s).
16K
32K
48K
64K
Initial video mode
Unused
40 x 25 Monochrome on the color card.
80 x 25 Monochrome on the color card (RGB output).
80 x 25 Monochrome on the monochrome card ( Monochrome
output).
Number of floppy drives — bit value plus I if bit 0 is set
I drive
2 drives
3 drives
4 drives
Unused
Number of RS-232 cards in the system.
The standard I/O on this system emulates the IBM PC I/O, so the
minimum will be two.
Game VO card is installed, for using joysticks, paddle controllers,
etc.
Unused
Number of printers installed.
Central Processing Unit
Page 4.9